Oxygen-sensing system

Details Oxygen-sensing system Oxygen-sensing system

1983-10-26

1985-05-28

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

123440, G01N 2712

Patent

active

045192375

ABSTRACT:
A sensing element exposed to a gas to be analyzed has an internal resistance which depends on its temperature and also on the oxygen concentration in the gas. A thermistor has an internal resistance which depends on its temperature. The thermistor is positioned near the sensing element so that the temperature of the thermistor substantially coincides with the temperature of the sensing element. The ratio of the internal resistances of the thermistor and the sensing element is substantially independent of the temperature of the thermistor and the sensing element but is dependent on the oxygen concentration in the gas. A first device serves to sense the internal resistance of the thermistor and thereby determine the temperature of the sensing element. A second device serves to sense the ratio of the internal resistances of the thermistor and the sensing element and thereby determine the oxygen concentration in the gas. At first, the first device is enabled and the second device is disabled. When the determined temperature of the sensing element rises to a predetermined reference level, the first device is disabled and the second device is enabled.

REFERENCES:
patent: 4094186 (1978-06-01), Wessel
patent: 4147513 (1979-04-01), Bienkowski et al.
patent: 4258563 (1981-03-01), Yasuda et al.
patent: 4306444 (1981-12-01), Hattori et al.
patent: 4462374 (1984-09-01), Kobayashi et al.

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